Haven't seen too much of him, but I like his attacking style.
Good serve and volley game... big hitter as well... But that's not enough...
Where is his return game?!
i wonder if he can grind it out well enough at the baseline like Simon, or work the angles Davydenko style. Those are the areas he'll need to improve on if he wants to break serve more often. His return of serve on the backhand side needs work.
Holding serve is only half the battle, he needs to be able to break his opponent's serve often.
Disclaimer: I'm NOT a coach...
Real tennis: https://www.youtube.com/watch?v=yDqnkLJ9BtM